Abstract
Temporal coherent and total intensity fluctuations of acoustic wave propagation have been measured during SWAT (Shallow Water Acoustic Technology) 2000 Experiment data. The objective of this paper is to investigate the effect of the temporal fluctuation of an acoustic signal in shallow water. The acoustic propagation experiment was carried out among the three bottom mounted sonar towers, that were located in a triangle formed by 3, 4 and 5 km ranges. The center frequency of the acoustic signal is 5.5 kHz. A total of 32 hours acoustic data was sampled by a 2 min or 20 min sampling interval. In addition, oceanographic data including current velocity profile data and sound speed data is used to estimate the internal wave activity on the observation triangle. The time series of coherent intensity quickly attenuates, while the total intensity is maintained with weak fluctuation. According to the reciprocal transmission data, the reciprocity of coherent intensity is significantly distorted by the existence of a large internal wave, while the total intensity retains the reciprocity. The characteristics of these quantities are discussed by using the PE (Parabolic Equation) model. [Work supported by ONR 321OA, NIRE, and MEST.]
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